问Java有效对象池，具有要池化的固定数量的对象，并使用等待通知

EN

    import java.util.ArrayList;
import java.util.List;

class ObjectPool
{
    static List objects = new ArrayList();
    static
    {
        objects.add("Object One");
        objects.add("Object Two");
    }
    public Object getObject()
    {
            synchronized(objects)
            {
                if(objects.isEmpty())
                {
                    System.out.println(Thread.currentThread().getName()  + " waiting as Object Pool is empty");
                    try {
                        objects.wait();
                        System.out.println(Thread.currentThread().getName()  + " Got Notification");
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                Object locked = objects.get(objects.size()-1);
                objects.remove(locked);
                System.out.println(Thread.currentThread().getName()  + " got lock of object : "+ locked);
                return locked;
        }
    }

    public boolean release(Object released)
    {
        synchronized(objects)
        {
        System.out.println(Thread.currentThread().getName() + " releasing Object : "+released);
        objects.notify();
        return objects.add(released);
        }
    }
}


    public class MainforObjectPool implements Runnable
    {
        static ObjectPool p = new ObjectPool();
        public static void main(String[] args)
        {
            MainforObjectPool m = new MainforObjectPool();

            Thread t1 = new Thread(m,"thread 1");
            Thread t2 = new Thread(m,"thread 2");
            Thread t3 = new Thread(m,"thread 3");
            Thread t4 = new Thread(m,"thread 4");
            Thread t5 = new Thread(m,"thread 5");



            t1.start();
            t2.start();
            t3.start();
            t4.start();
            t5.start();


            System.out.println("Main Thread Completed");


        }

        public void run()
        {
            Object locked = p.getObject();
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            p.release(locked);
        }
    }